Media Remoting: Add remoting control logic for encrypted contents.

media/remoting/remoting_renderer_controller.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef MEDIA_REMOTING_REMOTING_CONTROLLER_H_
-#define MEDIA_REMOTING_REMOTING_CONTROLLER_H_
+#ifndef MEDIA_REMOTING_REMOTING_RENDERER_CONTROLLER_H_
+#define MEDIA_REMOTING_REMOTING_RENDERER_CONTROLLER_H_
 
 #include "base/callback.h"
 #include "base/memory/weak_ptr.h"
 #include "media/base/media_observer.h"
-#include "media/mojo/interfaces/remoting.mojom.h"
-#include "mojo/public/cpp/bindings/binding.h"
+#include "media/remoting/remoting_source_impl.h"
 
-namespace base {
-class SingleThreadTaskRunner;
+namespace media {
+struct PipelineMetadata;
 }
 
-// This class does the following:
-// 1) Sends/Receives messages from/to Remoter;
+namespace media {
+
+// This class:
+// 1) Implements the RemotingSourceImpl::Client;
 // 2) Monitors player events as a MediaObserver;
 // 3) May trigger the switch of the media renderer between local playback
 // and remoting.
-//
-namespace media {
+class RemotingRendererController final : public RemotingSourceImpl::Client,
+                                         public MediaObserver {
+ public:
+  explicit RemotingRendererController(
+      scoped_refptr<RemotingSourceImpl> remoting_source);
+  ~RemotingRendererController() override;
 
-class RemotingController final : public MediaObserver,
-                                 public mojom::RemotingSource {
- public:
-  RemotingController(mojom::RemotingSourceRequest source_request,
-                     mojom::RemoterPtr remoter);
-  ~RemotingController() override;
-
-  // RemotingSource implementations.
-  void OnSinkAvailable() override;
-  void OnSinkGone() override;
-  void OnStarted() override;
-  void OnStartFailed(mojom::RemotingStartFailReason reason) override;
-  void OnMessageFromSink(const std::vector<uint8_t>& message) override;
-  void OnStopped(mojom::RemotingStopReason reason) override;
+  // RemotingSourceImpl::Client implemenations.
+  void OnStarted(bool success) override;
+  void OnSessionStateChanged() override;
 
   // MediaObserver implementations.
-  // This is called when the video element or its ancestor enters full screen.
-  // We currently use this as an indicator for immersive playback. May add other
-  // criteria (e.g. the actual display width/height of the video element) in
-  // future.
   void OnEnteredFullscreen() override;
   void OnExitedFullscreen() override;
   void OnSetCdm(CdmContext* cdm_context) override;
   void OnMetadataChanged(const PipelineMetadata& metadata) override;
 
-  using SwitchRendererCallback = base::Callback<void()>;
-  void SetSwitchRendererCallback(const SwitchRendererCallback& cb);
+  void SetSwitchRendererCallback(const base::Closure& cb);
 
-  // Tells which renderer should be used.
-  bool is_remoting() const {
-    DCHECK(task_runner_->BelongsToCurrentThread());
-    return is_remoting_;
-  }
-
-  base::WeakPtr<RemotingController> GetWeakPtr() {
+  base::WeakPtr<RemotingRendererController> GetWeakPtr() {
     return weak_factory_.GetWeakPtr();
   }
 
+  // Used by RemotingRendererFactory to query whether to create Media Remoting
+  // Renderer.
+  bool remote_rendering_started() const {
+    DCHECK(thread_checker_.CalledOnValidThread());
+    return remote_rendering_started_;
+  }
+
+  // Used by RemotingRendererImpl to query the session state.
+  RemotingSourceImpl* remoting_source() const {
+    DCHECK(thread_checker_.CalledOnValidThread());
+    return remoting_source_.get();
+  }
+
  private:
   bool IsVideoCodecSupported();
   bool IsAudioCodecSupported();
 
   // Helper to decide whether to enter or leave Remoting mode.
   bool ShouldBeRemoting();
 
   // Determines whether to enter or leave Remoting mode and switches if
   // necessary.
   void UpdateAndMaybeSwitch();
 
-  // Indicates if this media element or its ancestor enters full screen.
+  // Indicates whether this media element or its ancestor is in full screen.
   bool is_fullscreen_ = false;
 
-  // Indicates the remoting sink availablity.
-  bool is_sink_available_ = false;
-
-  // Indicates if remoting is started.
-  bool is_remoting_ = false;
+  // Indicates whether remoting is started.
+  bool remote_rendering_started_ = false;
 
   // Indicates whether audio or video is encrypted.
   bool is_encrypted_ = false;
 
   // Current audio/video config.
   VideoDecoderConfig video_decoder_config_;
   AudioDecoderConfig audio_decoder_config_;
   bool has_audio_ = false;
   bool has_video_ = false;
 
   // The callback to switch the media renderer.
-  SwitchRendererCallback switch_renderer_cb_;
+  base::Closure switch_renderer_cb_;
 
-  mojo::Binding<mojom::RemotingSource> binding_;
-  mojom::RemoterPtr remoter_;
+  // This is initially the RemotingSourceImpl passed to the ctor, and might be
+  // replaced with a different instance later if OnSetCdm() is called.
+  scoped_refptr<RemotingSourceImpl> remoting_source_;
 
-  // TODO(xjz): Add a media thread task runner for the received RPC messages for
-  // remoting media renderer in the up-coming change.
-  const scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
+  // This is used to check all the methods are called on the current thread in
+  // debug builds.
+  base::ThreadChecker thread_checker_;
 
-  base::WeakPtrFactory<RemotingController> weak_factory_;
+  base::WeakPtrFactory<RemotingRendererController> weak_factory_;
 
-  DISALLOW_COPY_AND_ASSIGN(RemotingController);
+  DISALLOW_COPY_AND_ASSIGN(RemotingRendererController);
 };
 
 }  // namespace media
 
-#endif  // MEDIA_REMOTING_REMOTING_CONTROLLER_H_
+#endif  // MEDIA_REMOTING_REMOTING_RENDERER_CONTROLLER_H_